Preheat oven to 350°F (175°C).

In a bowl, cream butter until smooth.

Mix in parmesan cheese and rosemary.

Add flour and salt, mixing until a soft dough forms.

Roll dough out on a floured surface to about ¼ inch thickness.

Cut into snowflake shapes using a cookie cutter.

Place on a lined baking sheet.

Sprinkle with extra parmesan if desired.